Electronic Properties of Ceramic Films

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Electronic Properties of Ceramic Films

• Tim Jurasevich
• Advisor Dr. Kvam

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Outline

• Background Info
• Goals
• Procedure
• Results
• Conclusions

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Perovskites

• ABO3
• Middle atom can move
• Cubic above Curie temperature
• Structure changes below Curie temperature
• Permanent dipole

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Conductive Metal Oxides

• Conductive
• Middle atom wont move
• Not capacitive
• Ferroelectric Fatigue

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SrRuO3

• Orthorhombic
• a 5.57 Å
• b 7.86 Å
• c 5.54 Å
• Nearly Tetragonal

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LaNiO3

• Rhombohedral
• a 5.45 Å
• Low degree of tilt
• Nearly Cubic

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Research Goals

• Create Strontium Ruthenate (SrRuO3) and Lanthanum
  Nickelate (LaNiO3) thin films
• Sol-gel process
• Refine process
• Investigate properties of the thin films

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Sol-gel process

• SrRuO3 sol-gel
• RuCl3
• Ethanol
• Water
• SrAc2
• H2O2
• Black
• More black

• LaNiO3 sol-gel
• La(NO3)3
• 2-methoxyethanol
• MEA
• NiAc2
• Dark Blue

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Sol-gel process

• Spin coated
• SrRuO3 on Silicon
• LaNiO3 on Glass
• Annealed
• SrRuO3 _at_ 800C
• LaNiO3 _at_ 700C

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Visual Inspection
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Sputtering Platinum

• Platinum stripes sputtered along the edges and in
  the middle
• Lots of platinum required for good electrode

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Optical Microscopy
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X-Ray Diffraction
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X-Ray Diffraction
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X-Ray Diffraction
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Resistivity

• SrRuO3
• ? 350 µ?cm
• Ideal 300 µ?cm
• LaNiO3
• ? 700 µ?cm
• Ideal 600 µ?cm

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Conclusions

• SrRuO3 and LaNiO3 can be prepared by sol-gel
  methods
• Both thin films exhibit fairly low resistivities
• Process variations affect crystallographic
  texture

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Thank You

• Questions?
• Comments?